Compression load cells are classified according to Stress Relief Factors in a Compression Load Cell the manner in which the sensing unit reacts to stress when being compressed. A compression load cell is compressed or bent rather than a tensile load cell that is stretched. The former bends very slightly as it is compressed and is often mounted on a drum whereas the latter stretches across the frame. They are generally preferred over tensioned cells because they are more resistant to bending, are light in weight and easier to install. It is worth noting that a compression load cell fitted to a roof is not necessarily an effective solution to the problem of excessive swaying and movement caused by roof loads.
If mounting a compression load cell to a load bearing surface (roof, deck or floor), it is worth noting that installation can be quite difficult owing to the requirement for a special type of fastening method that avoids the use of screws or nails. Most manufacturers advise against the use of flashing between the roof and load bearing surfaces because such devices can cause damage to the surface. The best option would be to install the device flush with the surface – however, care should be taken to ensure that the device is mounted firmly to avoid unwanted “wear” during operation. In addition, many modern roofing materials have damp proof features that provide additional protection against wear and tear.
The general rule is that compression load cells should only be used in situations where the application can tolerate small amounts of force being applied to the holding device. In other words, force levels need to be very low. For example, if a crane is to be used for handling heavier loads, it would be better to use a tension shear instead of a compression load cell. Another situation where these devices should not be used is when the application requires extremely low temperatures. For these types of applications, mechanical or hydraulic pressure transducers are normally preferable because they can detect extremely low temperatures.
Compression Vs Tension Load Cell – Which One Is Best For Your Needs?
In essence, a compression load cell is simply a block which is built to hold a certain load in one location to measure the compression or static pressure. While tension load cells calculate the pulling force by means of hydraulic or mechanical means, compression load cell by means of electromagnetic impulses is more widely used and is the more preferred choice. Basically, when a material is compressed, or held down by a force, there will be a change in its volume. Thus, the amount of the change in the volume will be expressed as a force called compression.
One very common type of compression load cell, or strain gauge, is the canister gauge. These canister gauges work in a very similar fashion to tension ones, where the load cell blocks are placed in a canister and a device measures the change in volume due to compression or strain. This particular type of measurement has been around for a long time, as canister gauges have been found in use in Egypt many hundreds of years ago. In today’s day and age, as technology has advanced, strain gauges have become lighter, smaller, and more efficient than ever before, and this trend shows no sign of slowing. While these gauges can be found in a variety of different locations, such as oil & gas company compressor stations, chemical plants, and even aircraft hangars, it is possible to purchase canister load cell units online.
A tension gauge, on the other hand, measures the pull of a material against gravity, or just compression. In order to perform this measurement, a device is placed above the item being measured, and it measures the change in weight as a result of compression or tension. Obviously, the tension gauge is far less expensive than the compression load cell, but they are not without their differences. As previously stated, they cannot be purchased in an online store, and they are often attached to the equipment being measured, which makes them more bulky and unwieldy.